Problem: my Holybro RTK GPS is not recognised by my pixhawk on QGrondControl

Hey, I have connected an holybro RTK GPS to my pixhawk but when I connect my pixhawk to my QGroundControl it is not recognized. Here is my wiring and the GPS icons on my QGround is white as nothing is connected. Can anyone help me with this ?

Which RTK GPS module is that exactly? So I can look up the wiring etc.